Double-headed wrench



FIG. 1 is front elevational view thereof;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The right side elevational view is a mirror image of the left side shown. 

The ornamental design for a double-headed wrench, (the article which embodies the design or to which it is applied) as shown and described. 